KR20170043994A - Portable water quality measuring device - Google Patents

Abstract

The present invention relates to a portable water quality measuring device. The present invention includes: a plate-shaped housing where a window as an opening region is formed in one side plate surface and an accommodating groove is formed in a side surface; a control module disposed in the housing; a display module coupled with the control module to be exposed to the outside through the window and displaying information in response to control by the control module; and a sensor unit measuring the water quality of an object of measurement and including an extending portion having one side coupled with the control module and a sensor head coupled with the other side of the extending portion. The sensor unit is accommodated in the accommodating groove of the housing and can be withdrawn from it. According to the present invention, a wide display region is provided along with a compact size, and thus a user can carry it around with ease.

Description

[0001] PORTABLE WATER QUALITY MEASURING DEVICE [0002]

The present invention relates to a portable water quality measuring apparatus. More particularly, the present invention relates to a portable water quality measuring device that can be miniaturized with a thin plate-like structure, for example, as a mobile phone, while allowing a user to easily receive and carry a user's pocket or the like while providing a wide display area.

Water pollution caused by urban sewage and industrial wastewater in modern society not only destroys ecosystem but also causes depletion of water resources needed for industrial, agricultural and drinking water, and is becoming a serious social problem. For example, although groundwater still remains clean, exhaustion and pollution are accelerating due to indiscreet development.

In recent years, as the awareness of the importance of management and use of water resources has increased, a variety of management systems have been developed and applied to prevent pollution and efficient use of water resources. Such water resources are used not only in industrial sites, And so on.

In recent years, as the living environment gradually becomes eco-friendly, hydroponic cultivation methods for directly growing hydroponic plants such as buds, organic vegetables, and small fruit trees in the home are spreading. Various types of hydroponic cultivation methods Has installed a domestic aquarium. In this case, each household should be supplied with water of suitable water quality to grow the corresponding hydroponic plant or aquarium fish, and it should be managed directly by the user to maintain optimal condition.

In addition, recently, the salinity of food has been known to have a considerable influence on health, and the use of salinity meter for measuring food salinity in homes and restaurants is also increasing.

Portable water quality measuring devices which can be widely used for domestic and industrial purposes are widely used to measure the water quality characteristics of measurement objects. The portable water quality measuring devices are classified into salinity, pH (pH), electrical conductivity (EC : Electric Conductivity), and TDS (Total Dissolved Solids).

1 is a perspective view of various portable salinometers according to prior art. As shown in the figure, the portable salamiometer 10 includes a bar-shaped body 11 having a predetermined length and a sensor unit 14 provided at one end of the body 11. [ The main body 11 is provided with a display panel 12 for displaying various kinds of information including measurement results and an operation part 13 for operating the measurement device. The sensor part 14 is immersed in the measurement object, and a sensor electrode 15 for measuring pH, EC or TDC.

Since the measurement is performed in a state in which the sensor unit 14 is sufficiently immersed in the measurement object, the portable salinity meter 10 is provided with the sensor unit 14 and the body 12 so that the display panel 12 is not contaminated by the measurement object or immersed in the measurement object. (11). Therefore, in the conventional portable salinometer, the sensor portion 14 is formed to have a predetermined length, so that the pen portion is formed to have an elongated overall length.

The portable salamiometer 10 is essentially provided with a display panel 12 on the main body 11 so that the user can confirm the measurement results and the like. The display panel 12 displays the measurement type, temperature, Unit, and power source, so that a predetermined size must be secured. In addition, in recent years, the portable salinity meter has been increasing in display panel 12 in order to provide more various information about the object to be measured through the display panel 12.

Such a conventional portable salinometer is disadvantageous in that it is inconvenient to carry because it is difficult to store in a user's pocket or the like because it is formed in a pen shape having a predetermined length. To solve this problem, there has been proposed a salinity meter equipped with a clip that can be inserted into a pocket. However, due to the weight of the salinity meter itself, it is very inconvenient to carry the clip using the clip.

In addition, the conventional portable salinometer has a pen shape, which limits the size of the display panel. Accordingly, the content of the information provided by the display panel is limited, and a residual power, a unit of a measurement type, When the display of all the information such as the measurement completion indication is displayed, the size of the character becomes small, and the user is also inconvenienced in confirming the information.

In recent years, the size of the panel has been gradually increasing to provide more information through the display panel. Accordingly, as shown in the drawing, in the conventional pen-type portable saliva meter, a part of the cylindrical body is cut to provide a display area as wide as possible to provide a display panel. However, the conventional portable salinometer has a pen shape, so that the size of the display panel is also limited.

Furthermore, in recent years, various display panels capable of being operated by the user's touch have been widely used. However, due to the limitation of the size of the display panel, the display panel having functions and display formats such as the touch screen is not applied to the conventional pen- In fact.

On the other hand, Korean Patent No. 10-1077919 proposes a card-type multimeter which is easy to carry, but the card-type multimeter of the registered patent is a method of directly measuring a sample by dropping it on a measuring device, , The sensor unit) is immersed in the measurement object.

Korean Patent Laid-Open Publication No. 10-2015-0093980 (published on Aug. 19, 2015, name: pen-type complex water quality measuring device) Korean Registered Patent No. 10-1077919 (registered on October 24, 2011, name: card type multi-meter)

SUMMARY OF THE INVENTION The present invention has been proposed in order to solve the above-mentioned problems, and it is an object of the present invention to provide a water quality measuring apparatus which measures a sensor unit by immersing the sensor unit in a measurement object, And it is an object of the present invention to provide a portable water quality measuring device that allows a user to easily carry it in a pocket.

It is another object of the present invention to provide a portable water quality measuring apparatus which is simple to carry along with miniaturization and has a wider display panel.

It is another object of the present invention to provide a portable water quality measuring apparatus which can omit command buttons for driving the apparatus by interlocking the receiving and extracting operations of the sensor unit with the apparatus driving and improving the convenience of use.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described herein, there is provided a portable water quality measuring apparatus comprising: a housing having a plate shape, a window having an opening region formed on one side thereof, A control module installed in the housing; a display module coupled to the control module so as to be exposed to the outside through the window, the display module displaying information according to the control of the control module, And a sensor unit including a sensor head coupled to the other end of the extension unit and measuring a quality of a measurement object, wherein the sensor unit is accommodated in a receiving recess of the housing.

In the portable water quality measuring device according to the present invention, the extension part included in the sensor part is constituted by an extension cable having flexibility, and the sensor part is accommodated in the accommodation groove while being wound around the side surface of the housing, .

The portable water quality measuring device according to the present invention is characterized in that the extension part included in the sensor part is constituted by a sliding rod having a multi-stage structure, and the sensor part is configured to be accommodated in the accommodating groove in a sliding manner or drawn out from the accommodating groove .

In the portable water quality measuring device according to the present invention, the extension part included in the sensor part is configured such that one end thereof is hinged to the housing so as to be rotatable, and the sensor part is hinged to the receiving groove of the housing And is configured to be received or drawn out from the receiving groove.

The portable water quality measuring apparatus according to the present invention is characterized in that the housing has a polygonal, circular or elliptical plate shape including a quadrangle.

The portable water quality measuring apparatus according to the present invention may further include on / off driving means for sensing the drawn-out state and the accommodated state of the sensor unit and driving on / off the control module, the display module, and the sensor unit do.

In the portable water quality measuring apparatus according to the present invention, the on / off driving means includes a magnet member provided on the sensor head and a reed switch provided on the control module and turned on / off according to the magnetic force of the magnet member, And a control unit.

In the portable water quality measuring apparatus according to the present invention, when the measurement object and the sensor electrode included in the sensor unit reach a thermal equilibrium state, a measurement result of the measurement object is displayed on the display panel And a control unit.

In the portable water quality measuring apparatus according to the present invention, the display panel may be a touch screen panel.

In the portable water quality measuring apparatus according to the present invention, the sensor unit may measure at least one of salinity, TDS, EC, and pH.

According to the present invention, since the body portion has a thin plate shape and the sensor portion is flexible so as to be easily accommodated in the groove formed on the side surface of the body portion, the portable water quality There is an effect that a measuring device is provided.

Further, since the sensor unit can be easily taken out of the sensor unit during use, the sensor unit can be easily immersed in the measurement object, thereby providing a portable water quality measurement device capable of easily measuring the measurement object while preventing contamination of the main body.

In addition, a portable water quality measuring device capable of arranging a wide display panel and providing more various information is provided.

The portable water quality measuring device according to the present invention has the advantage of providing a portable water quality measuring device capable of omitting a command button for driving the device by interlocking the receiving and extracting operation of the sensor unit with the device driving and improving the ease of use.

Figure 1 is a diagram of a portable salinometer according to the prior art,
2 is a view illustrating a state in which a sensor unit constituting a portable water quality measuring apparatus according to an embodiment of the present invention is accommodated in a sensor groove provided in a housing,
3 is a view illustrating a state in which a sensor unit constituting a portable water quality measuring apparatus according to an embodiment of the present invention is drawn out from a sensor groove provided in a housing for water quality measurement,
4 is an exploded perspective view of a portable water quality measuring apparatus according to an embodiment of the present invention,
5 is a cross-sectional view schematically showing an internal structure of a portable water quality measuring apparatus according to an embodiment of the present invention,
6 is a functional block diagram of a portable water quality measuring apparatus according to an embodiment of the present invention,
7 is a view illustrating a portable water quality measuring apparatus according to another embodiment of the present invention,
8 is a view illustrating a portable water quality measuring apparatus according to another embodiment of the present invention.

It is to be understood that the specific structural or functional description of embodiments of the present invention disclosed herein is for illustrative purposes only and is not intended to limit the scope of the inventive concept But may be embodied in many different forms and is not limited to the embodiments set forth herein.

The embodiments according to the concept of the present invention can make various changes and can take various forms, so that the embodiments are illustrated in the drawings and described in detail herein. It should be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms disclosed, but includes all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms may be named for the purpose of distinguishing one element from another, for example, without departing from the scope of the right according to the concept of the present invention, the first element may be referred to as a second element, The component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like are used to specify that there are features, numbers, steps, operations, elements, parts or combinations thereof described herein, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the meaning of the context in the relevant art and, unless explicitly defined herein, are to be interpreted as ideal or overly formal Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view illustrating a state in which a sensor unit constituting a portable water quality measuring apparatus according to an embodiment of the present invention is accommodated in a sensor groove provided in a housing, and FIG. 3 is a view illustrating a portable water quality measuring apparatus according to an embodiment of the present invention. FIG. 4 is an exploded perspective view of a portable water quality measuring apparatus according to an embodiment of the present invention, and FIG. 5 is a perspective view of the portable water quality measuring apparatus according to an embodiment of the present invention. 1 is a cross-sectional view schematically showing an internal structure of a portable water quality measuring apparatus according to an embodiment.

2 to 5, a portable water quality measuring apparatus 100 according to an embodiment of the present invention includes a housing 110 having a predetermined thickness, a housing 110 housed in the housing 110, A display panel 130 mounted on the control module 120 and exposed to the outside through a window 112 which is an opening region provided on one side of the housing 110, And a sensor unit 140 accommodated along the side surface of the housing 110. That is, the portable water quality measuring apparatus 100 of the present invention is configured such that the housing 110 has a thin plate shape and the sensor unit 140 is accommodated in the housing 110 along the side surface of the housing 110. According to this configuration, the user can easily carry the portable water quality measuring apparatus 100 in a pocket.

More specifically, the housing 110 constitutes a main body of the portable water quality measuring apparatus 100 and includes therein components such as the control module 120, the display panel 130, and the sensor unit 140, do. For example, the housing 110 may be formed by an injection molding method using a synthetic resin, or may be a structure that is divided into an upper housing 110a and a lower housing 110b and coupled to each other. For example, a window 112, which is an opening area for exposing the display panel 130, is formed on one side of the upper housing 110a, and a sensor unit 140 is housed in a side surface of the housing 110 The sensor groove 111 is formed so as to be recessed inward.

For example, the housing 110 may have a thin plate shape having a predetermined thickness so as to be easily inserted into a user's pocket. Such a housing 110 may have any thin thickness, provided that it satisfies the condition that the sensor portion 140 is thicker than the sensor portion 140 so as to accommodate the sensor portion 140 on the side thereof. In addition, the housing 110 may have a circular, elliptical, rectangular or polygonal plate shape, and may have a rectangular plate shape having a thickness of about 10 mm, for example.

The control module 120 is an element for controlling the operation of the portable water quality measuring apparatus 100 and can be accommodated inside the housing 110, for example, in the form of an integrated circuit mounted on a printed circuit board . Various programs for driving the portable water quality measuring apparatus 100 are embedded in the control module 120.

The display panel 130 is mounted on a printed circuit board constituting the control module 120 and visually provides various information measured by the portable water quality measuring apparatus 100 to a user. For example, the display panel 130 may be an LCD module that is controlled by the control module 120, and may be exposed to the outside through the window 112 formed in the housing 110. [ And may be mounted on a printed circuit board constituting the circuit board 120. Since the display panel 130 is exposed to the outside through the window 112 provided on one side of the plate 110 having the plate shape, the display panel 130 may have a sufficient size corresponding to the plate area of the housing 110. Accordingly, the display panel 130 may be provided with all information such as a residual power source, a unit of a measurement type, a temperature, a temperature unit, and a measurement completion indication in a sufficiently large size, and may further provide various information related to the measurement apparatus can do. In addition, the display panel 130 is exposed to the outside through the window 112 provided on one side of the plate-shaped housing 110 and can provide a sufficient touch area, so that the display panel 130 can be configured as a touch screen panel.

For example, the sensor unit 140 includes a sensor head 141 having a plurality of sensor electrodes and a sensor head 140 mounted on the control module 120 (Not shown). For example, the sensor head 141 may include a pair of sensor electrodes for applying a voltage to a measurement object, and a temperature electrode for sensing the temperature of the measurement object, and each electrode is insulated by an extension cable 142, To the control module 120 within the controller 110.

One side of the sensor unit 140 is accommodated in the sensor groove 111 formed along the side surface of the housing 110 while being connected to the control module 120 inside the housing 110. 2, when the portable water quality measuring apparatus 100 is not used, the sensor unit 140 is accommodated in the sensor groove 111 while winding the side surface of the housing 110. [ The sensor groove 111 is formed to be recessed along the side surface of the housing 110 and has a depth and a length corresponding to the diameter and the length of the sensor unit 140. Therefore, the sensor 140 of the portable water quality measuring apparatus 100 of the present invention does not protrude to the outside of the housing 110, so that it can be easily inserted into or removed from the pocket without interference with external objects.

The extension cable 142 of the sensor unit 140 must be easily extended from the housing 110 when the portable water quality measuring apparatus 100 is used and be easily bent when the portable water quality measuring apparatus 100 is accommodated in the sensor groove 111, It is preferable to be made of a shape memory material having flexibility. For example, in the portable water quality measuring apparatus 100 according to the embodiment of the present invention, the extension cable 142 may be made of a silicon material.

The sensor unit 140 configured as described above is normally held in the sensor groove 111. When the portable water quality measuring apparatus 100 is used to measure the characteristics of the measurement object, when the user pulls the sensor unit 140 out of the sensor groove 111, the sensor unit 140 And extends linearly along the side surface of the housing 110. Even if the sensor head 141 is immersed in the measurement object in a state in which the sensor unit 140 is unfolded, the housing 110 maintains a sufficiently separated state from the measurement object. Therefore, the housing 110 can be cleaned without contamination of the housing 110 by the measurement object. Measurement can be easily performed. For example, a sensor protrusion may be formed on the sensor head 141 to allow the user to easily pull out the sensor unit 140, and the sensor unit 140 accommodated in the sensor groove 111 of the housing 110 may be fixed A fixing protrusion may be formed.

A transparent protective panel 113 for protecting the display panel 130 may be attached to the front surface of the housing 110 on which the window 112 is formed. 120 may be fastened with a power supply 114 (battery) for power supply.

Meanwhile, the portable water quality measuring apparatus 100 according to an embodiment of the present invention may further include an automatic on / off driving unit for taking out and receiving the sensor unit 140. 5, a magnet member 143 is embedded in the sensor head 141 of the sensor unit 140 and a magnet member 143 is mounted on one side of the control module 120 housed in the housing 110. [ And a reed switch 123 that operates in correspondence with the reed switch 143 is incorporated.

Here, the reed switch 123 is configured to be turned on / off in response to the magnetic force of the magnet member 143. That is, when the sensor head 141 is received in the sensor groove 111, the on / off driving means using the magnet member 143 turns off the reed switch 123 by the magnetic force of the magnet member 143, The magnetic force is extinguished and the reed switch 123 is turned on when the sensor 141 is drawn out from the sensor groove 111. [

The portable water quality measuring apparatus 100 can be automatically turned on and off according to the drawing and receiving of the sensor unit 140 even when the portable water quality measuring apparatus 100 does not have any on / off means for user's operation by the magnet member 143 and the reed switch 123. [ / Off drive is possible. As described above, in the portable water quality measuring apparatus 100 according to the embodiment of the present invention, the on / off driving is automatically performed in accordance with the drawing and receiving of the sensor unit 140. The on / off driving means may be a combination of the magnet member 143 and the reed switch 123 as well as the combination of the magnet member 143 and the reed switch 123 when the sensor unit 140 is accommodated in the sensor groove 111, And the like.

6 is a functional block diagram of a portable water quality measuring apparatus according to an embodiment of the present invention. Although FIG. 6 discloses a configuration for salinity and temperature measurement for convenience of explanation, it is only one example, and a configuration for measuring salinity, TDS, EC, and pH may be provided.

6, the portable water quality measuring apparatus 100 may be configured such that the sensor electrode 151 and the temperature electrode 152 are connected to the control module 120 inside the housing 110 through the extension cable 142, The control module 120 includes a salinity measuring unit 162, a room temperature salinity converting unit 163, a temperature measuring unit 164, a thermal balance detecting unit 165, a memory 166, a panel driving unit 167, The panel driving unit 167 may be connected to the display panel 130 and the power supply unit 114 may be provided at one side of the control module 120. [ Here, a part of the salinity measuring unit 162, a part of the temperature measuring unit 164, the room temperature salinity converting unit 163, the thermal balance detecting unit 165, the memory 166, the panel driving unit 167, May be implemented as a single microcomputer (MCU).

For example, the sensor electrode 151, which is an electrode connected to the salinity measuring unit 162, can measure the salinity of an object to be measured by an electric conductivity method by transmitting a voltage applied by the salinity measuring unit 162 to the measuring object Let's do it. For example, the salinity measuring unit 162 may be made of a metal having good electrical conductivity and heat transfer characteristics, such as platinum-plated copper. The temperature electrode 152 is connected to the temperature measuring unit 164 to sense the temperature of the measurement object. For example, the temperature electrode 152 is a device whose resistance value changes with temperature. NTC and PTC are applicable, but platinum-plated NTC is suitable. The power supply unit 114 supplies the Vcc voltage to the circuit elements according to the power on / off control signal of the controller 161, and supplies the MVcc voltage, which is the measurement voltage, (162). The thermal equilibrium detection unit 165 measures the temperature of the measurement object through the temperature electrode 162, and then compares the measured temperature with the previous measurement temperature to calculate the temperature change amount. The temperature equilibrium detector 165 determines that the temperature equilibrium state is satisfied and the temperature measuring unit 164 and the salinity measuring unit 162 measure the temperature and salinity respectively. The measured temperature and salinity are converted into salinity values at room temperature in the room temperature salinity conversion unit 163 and displayed on the display panel 130. As described above, the portable water quality measuring apparatus 100 according to the embodiment of the present invention is configured to detect the thermal equilibrium state and perform the measurement automatically.

7 is a view illustrating a portable water quality measuring apparatus according to another embodiment of the present invention.

7, the portable water quality measuring apparatus 100 according to another embodiment of the present invention may be configured such that the sensor unit 140 is pulled out or received from the sensor groove 111 of the housing 110 by the sliding rod 144 . To this end, the sensor unit 140 is configured such that the sensor head 141 is fastened to the housing 110 with the sliding rod 144 having a multi-stage structure as an extended portion, the rod at one end is fixed to the housing 110, The remaining rod including the rod at the other end to which the rod 141 is connected is drawn out from the sensor groove 111 while being slid or accommodated in the sensor groove 111.

8 is a view illustrating a portable water quality measuring apparatus according to another embodiment of the present invention.

8, the portable water quality measuring apparatus 100 according to another embodiment of the present invention includes a sensor unit 140 having a hinge structure, which is coupled to the housing 110 and is pulled out from the sensor groove 111 by a hinge rotation Respectively. To this end, the sensor unit 140 includes a sensor head 141 coupled to the housing 110 with the pivot rod 145 as an extended portion, and the pivot rod 145 has one end thereof fastened to the housing 110 with a hinge structure. do. The sensor unit 140 is drawn out from the sensor groove 111 or accommodated in the sensor groove 111 by a hinge rotation method in which one end of the rotation rod 145 is rotated about an axis.

As described in detail above, according to the present invention, since the body portion has a thin plate shape and the sensor portion is flexible, the body portion is easily accommodated in the groove formed in the side surface of the body portion. There is an effect that a portable water quality measuring apparatus which can be carried can be provided.

Further, since the sensor unit can be easily taken out of the sensor unit during use, the sensor unit can be easily immersed in the measurement object, thereby providing a portable water quality measurement device capable of easily measuring the measurement object while preventing contamination of the main body.

In addition, a portable water quality measuring device capable of arranging a wide display panel and providing more various information is provided.

The portable water quality measuring device according to the present invention has the advantage of providing a portable water quality measuring device capable of omitting a command button for driving the device by interlocking the receiving and extracting operation of the sensor unit with the device driving and improving the ease of use.

110: Housing
111: Sensor home
112: Window
113: Protection panel
120: Control module
130: Display panel
140:
141: Sensor head
142: Extension cable
144: Sliding rod
145:

Claims (10)

A housing having a plate shape, a window being an opening region formed on one side of the plate, and a receiving groove formed on a side surface thereof;
A control module installed inside the housing;
A display module coupled to the control module to be exposed to the outside through the window, the display module displaying information according to the control of the control module; And
And a sensor unit including an extension coupled to the control module on one side and a sensor head coupled to the other side of the extension, the sensor unit measuring the quality of the measurement object,
Wherein the sensor unit is accommodated so as to be withdrawn into a receiving groove of the housing. The method according to claim 1,
Wherein the extension part included in the sensor part is formed of an extension cable having flexibility,
Wherein the sensor unit is configured to be accommodated in the accommodating groove while being pulled out from the accommodating groove while winding the side surface of the housing. The method according to claim 1,
Wherein the extension part included in the sensor part is constituted by a sliding rod having a multi-stage structure,
Wherein the sensor unit is configured to be received in the receiving groove or to be drawn out from the receiving groove in a sliding manner. The method according to claim 1,
Wherein the extended portion included in the sensor portion is hinge-coupled to the housing at one end thereof,
Wherein the sensor unit is configured to be received in the receiving groove of the housing or to be drawn out from the receiving groove in a hinge pivoting manner. The method according to claim 1,
Wherein the housing has a polygonal, circular or elliptic plate shape including a quadrangle. The method according to claim 1,
Further comprising on / off driving means for sensing the drawn-out state and the accommodated state of the sensor portion to turn on / off the control module, the display module, and the sensor portion. The method according to claim 6,
The on / off driving means
A magnet member provided on the sensor head, and a reed switch provided on the control module and turned on / off according to a magnetic force of the magnet member. The method according to claim 1,
The control module
Wherein the control unit controls the display unit to display a measurement result of the measurement object through the display panel when the measurement object and the sensor electrode included in the sensor unit reach a thermal equilibrium state. The method according to claim 1,
Wherein the display panel comprises a touch screen panel. The method according to claim 1,
Wherein the sensor unit measures at least one of salinity, TDS, EC, or pH.

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